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/**
 *  Theme from/to date combination in the view.
 *
 *  @param $field = the field settings
 *  @param $node = node information, this is not always available and not
 *     always the full node, it depends on what value was provided to the formatter.
 *     Only the nid is always guaranteed to be available.
 *  @param $dates - an array of date information, see explanation for date_field_object() for details.
 *
 *  Useful values:
 *    $field['type_name'] is the content type
 *    $field['type'] is the field type
 *    $node->nid is the node nid, get other node values using node_load($node->nid)
 *    $dates['value']['object']->local->timestamp - the local timestamp for the From date
 *    $dates['value2']['object']->local->timestamp - the local timestamp for the To date
 *    $dates['value']['object']->db->timestamp - the timestamp of the From date database (GMT) value
 *    $dates['value2']['object']->db->timestamp - the timestamp of the To date database (GMT) alue
 *    $dates['formatter'] = formatter name, i.e. 'default';
 *    $dates['value']['formatted'] = formatted From date, i.e. 'February 15, 2007 2:00 pm';
 *    $dates['value2']['formatted'] = formatted To date, i.e. 'February 15, 2007 6:00 pm';
 *
 */
function theme_date_display_combination($field, $dates, $node = NULL) {
  if ($field['type_name'] == 'potluck') {
    // do your overrides here.
    $date1 = $dates['value']['formatted'];
    $date2 = $dates['value2']['formatted'];
    if ($date1 == $date2 || empty($date2)) {
      return '<span class="date-display-single">'. $date1 .'</span>';
    }
    else {
      return '<span class="date-display-start">'. $date1 .'</span><span class="date-display-separator"> - </span><span class="date-display-end">'. $date2 .'</span>';
    }
  else {
    return theme_date_display_combination($field, $dates, $node);
  }
}